Met-enkephalin stimulates secretion of ACTH in sheep

in Journal of Endocrinology
Authors:
X.-M. Wang
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J. P. Coghlan
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M. Congiu
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B. A. Scoggins
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E. M. Wintour
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ABSTRACT

The ability of opioid peptides to affect plasma immunoreactive ACTH concentrations was examined in conscious sheep. Plasma concentrations of ACTH were significantly increased by an i.v. infusion of Met-enkephalin and its analogue (FK-33824). There was a dose-dependent increase in plasma concentrations of ACTH with a graded administration of FK-33824. The combined effect of Met-enkephalin and ovine corticotrophin-releasing factor (oCRF) or FK-33824 and oCRF on plasma concentrations of ACTH was greater than the effect of each peptide when given individually. This study demonstrates that Met-enkephalin and its analogue stimulate ACTH release in sheep.

J. Endocr. (1986) 111, 463–467

 

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